H2S--Can it be dissociated via Microwaves
H2S--Can it be dissociated via Microwaves
(OP)
Another H2S question---Has anybody ever tried microwaves to breakdown the H2S? I haven't looked at the thermo, but I figure that the structue might be labile to microwave degradation. Any thoughts?





RE: H2S--Can it be dissociated via Microwaves
RE: H2S--Can it be dissociated via Microwaves
2) If one did break apart an H2S molecule (maybe using a laser), you'd have 2 H. and one S.. radical in close proximity. Maybe reform H2S!
3) Maybe useful to consider the thermal stability of H2S on the above. Above the melting point of sulfur, have
ΔGfH2S = -86920.2 + 7.26474*T*log(T) + 23.95049*T J/mol [T = 800-1200 K]
derived from JANAF data.
RE: H2S--Can it be dissociated via Microwaves
Kenvlach's response reminds me that one of the problems with handling H2S in the first place (in pipelines) is its propensity to dissociate and drop out solid sulfur. At the same time it gives off H+ which can migrate through the lattice of the containment vessel material giving rise to the need for highZ plate and HIC testing.
If you are trying to separate sulfur from hydrogen in large amounts, be prepared for metallurgical issues.
Otherwise, I'd go with Kenvlach's heat of formation solution. In a given containment volume you can calculate the input energy requirements to raise the H2S to instability which will give you the cooking time. H2S is an unsymmetrical molecule so it should be excitable.
You would need some fancy design for the containment vessel. Where would you put the magnetron?
Laser might be a more easily controlled tool.
Stand very clear the first time you try it.
Wild scheme.. fill a ballon with H2S, Cook it to dissociate the gas and finish up with hydrogen on the outside and sulfur on the inside ... WOW!! I'm a genius.
Or did someone already invent the molecular seive?
RE: H2S--Can it be dissociated via Microwaves
RE: H2S--Can it be dissociated via Microwaves
Full thermal dissociation is around 650 degC I think.
I suspct that the low pressure dissociation is promoted by low partial pressure. I never looked at the energy structure in any detail but there has to be someone out there who did.
There has been research doing this with electrical potentials.
If you are rally serious about this I suggest going to your local technical library and do some searches on www.ScienceDirect.com
David
RE: H2S--Can it be dissociated via Microwaves
Some very interesting papers:
'Electrochemical Membrane Separation (EMS) of Hydrogen Sulfide from Coal Gasification Streams.'
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'Hydrogen Production from Hydrocarbons, H2O and H2S,. Stimulated by Non-Thermal Atmospheric Pressure Plasma
http:
'High-Temperature Pyrolysis by Laser Gas Breakdown' Ind. Eng. Chem. Prod. Res. Dev., vol. 20, 396-399 (1981)
http://
'Production of Hydrogen and Sulfur from Hydrogen Sulfide in a Nonthermal-Plasma Pulsed Corona Discharge Reactor'
-- abstract only, from a 2005 conference:
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RE: H2S--Can it be dissociated via Microwaves
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